Port construction for metallurgical furnaces



a. F. DOWNS AND H. F. MILLER, Jn. PORT CONSTRUCTION FOR METALLURGICAL FURNACES.

APPLICATION HLED MAYI5.1919.

1,343,315 Q 7 Patented June 15, 1920..

2 SHEETS-SHEET I.

a. nnowws AND H. F. MILLER, JR. PORT CONSTRUCTION FORMETALL UR GICAL FURNACES.

APPLICATION FILED MAY15,1919.

Patehted June 15,1920.

2 SHEETS-SHEET 2- GEORGE F. DOWNS AND HERBERT F. MILLER, JR., OF BUFFALO, NEW YORK; SAID MILLER ASSIGNOR TO SAID DOWNS.

PORT CONSTRUCTION FOR METALLURGICAL FURNACES.

Specification of Letters Patent. 7 Pat t d Ju 15 1920 Application filed May 15, 1919. Serial No. 297,362.

To all whom it may concern:

.Be it known that we, GEORGE F. Downs and HERBERT F. MILLER, J r., citizens of the United States, and residents of Buffalo, in the county. of Erie and State of New York, have invented certain new and useful Improvements in Port Construction for Metallurgical Furnaces; and We do hereby de-' ments in the type of port construction described in our application for patent, filed March 30, 1918, Serial Number 225,647.

The object of the present invention is to provide a construction by means of which a thorough and complete intermixture of the air with the gas will be produced before the gas reaches the hearth, so as to start combustion at the earliest possible instant, on the inside of the as volume as well as on the outside thereo thereby producing a.

mixture reaches the hearth.

The advantage of such early and com-- plete combustion of the gas is that first the furnace is made capable of greater production in a given length of time; and secondly, a reduction of the dimensions of the walls of the port is made possible, thus greatly conserving the expensive refractory material in building as well as reducing the wearing surface of the walls and increasing the life of the furnace.

The advantages of the invention will ap-. pear as we proceedwith the specification.

In the drawings:

Figure 1 is a view representingin longitudinal section, one end of an openhearth furnace provided with on! improvements.

Fig. 2 is a view representing a vertical section through the parts shown inFig. 1,

' in a plane indicated by the line 22 of said figure.

F g. 3 is a view representing a horizontal sect1on through the parts of the furnace shown in Fig. 1 in a plane indicated by the line 3-3 of Fig. 1.

Fig. 4 is a view representing a vertical,

transverse sectlonal view in a plane indicated by the line 44 of Fig. 1. a

' The construction in the drawingsshows the application of our invention to a wellknown type of open hearth furnace. Referring now to that embodiment of the invention illustrated :1,() indicates, as a whole, an open hearth furnace, and 11, the furnace chamber. 12 indicates thegas up take; 13 indicates the air uptake, said uptake in this case having three vertical branches 13, 13 and 13; 14 indicates the gas port; and 15, the air port.

16 indicates a gas flue, the inner orifice end providing the gas port 14. Said gas fiue is made of metal and is generally of the type shown'in the application of George F. Downs filed March 5, 1918, Serial Number 220,454. It consists specifically of a .hollow, annular shell 17 comprising concentrically arranged, radially spaced, tubular members,-namely: an outer member 19, and an imier member 18,and end members 20, 21, the end member 20 being the one next adjacent to the gas uptake and the end member 21 being the one nearest the hearth.

The flue 'shell 17 is positioned with its outer end extending into the gas uptake, while its inner end is extended to or into the air port,the axis of the shell being inclined downwardly to direct the fuel down upon the hearth. The inner end of the metal shell providing the flue, does not extend across the upper end of the air uptake or uptakes, as in the case of the specific conwhen gas issues from the orifice or port end 14 of said flue, {the body of gas will not only be surrounded by the air in the air port, as'

in our previous'construction, but in addition said gas body will flow across the path of the current of hot air coming up through the air uptake or uptakes. The result of this arrangement is to produce a thorough and complete mixture of the air with the gas at the port'orifice of the flue, not only about the outer periphery of the body of gas issuing from the gas port, but also with the gas in the ifiterior of said body, this intermixture being brought about by the well-known action of two currents of fluid which intersect at an angle. -The impingement of the two currents, theone upon the other, produces a thorough intermingling of the component parts of the two currents so as to thoroughly intermingle and mix them.

The flue 16 is supported in the desired position in any convenient manner, either by the walls of the furnace construction or in- I dependently thereof. In the specific construction illustrated, the flue is supported directly in the upright wall 12 of the furnace.

The flue is water cooled as heretofore, cooling water being led thereto from a source of supply not shown, and being discharged therefrom in a familiar manner 'by means of pipes 22, 23 and 24. These pipes I as shown in the drawings,is not in the plane of the insideof the end wall of the air port, but. is at right angles to the center line of the gas flue. Bythis' arrangement, a better control of the gas flame is obtained and a better and cheaper method of manufacture, than could have been obtained with a port,- the plane of whose orifice lay in the plane of said inside face of the wall of the air up-- take or in a plane parallel thereto.

While in describing and illustrating our invention, we have-referred to certain details of mechanical construction andv arrangement, it is to be understood that the invention is in no way limited thereto, ex-

cept as may be pointed out in the appended claims. I

We claim as our invention: v

1. In a furnace of the kind described, in combination with the furnace walls defining gas and air uptakes and an air port, a gas flue connecting the gas uptake with the interior of the air port, said gas flue being p0- sitioned to discharge across and at an angle to the upward path of the air coming through the air uptake. 7

2. n a furnace of the kind described, in combination with the furnace walls defining gas and air uptakes and an air port, a gas flue connecting the gas uptake with the interior of the air port, said gas flue having its port end terminating at a point in the plane of and above the air uptake.

3. In a furnace of the kind described, in combination with the furnace walls defining gas and air uptakes and an air port," a gas flue connecting the gas uptake with the interior of the air port, said flue being positioned to discharge gas across and at an angle to the updraft of air in the air uptake so that as the body of gas issues from the port end of the flue it will be entirely sur rounded by'and will be intermin led with the air rising through the air upta e.-

4. In a furnace of the kind described, in combination with the furnace walls defining gas and air uptakes and an air ort, a tubular gas flue extending into sai connect the gas uptake with the interior of the air port, said flue terminating at a point air port to.

above the air'uptake and short of the wall defining the bottom of the air port, and means supportingsaid gas flue so that gas discharged from said gas flue is completely surrounded'by the air in said air, port and is directed at an angle'across the path of the air rising through said air uptake.

' 5. In a furnace of the kind described, in

combination with the furnace walls defining gas and air uptakes and an air port, means providing a tubular gas flue, to connect. the

said flue terminating at a point above the air uptake and short of the wall defining the bottom of the air port, and means supporting said as flue so that gas'discharged from said gas ue is completely surrounded by the air in said air port and is directed at an angle across the path of the air rising through said air uptake.

6. In a furnace of the kind. described, in

combination with thefu'rnace walls defining gas and air uptakes and'an air port, means providinga gas flue for connectingthegas uptake with the .interior'of the air port, said gas flue being positioned to discharge gas across and at an angle to the updraft of air kind described, in"

' gas uptake'with the interior of the air port,

in the air uptake and having the lowest the 1JIJresence of two witnesses, this 12th day point of its orifice above the wall defining of ay, A. D. 1919.

the bottom of the air port, the portend of GFORGE F. DOWNS. said flue being arranged in a plane perpen- HERBERT F. MILLER, JR. 5 dicular to its longitudinal central axis. Witnesses In testimony that we claim the foregoing J ULE WUNsoH,

as our invention, we afiix our signatures, in W. J. BRYAN. 

